Workers carve ice art works at Harbin Ice and Snow World one day before the 32th Harbin International Ice and Snow Festival in Harbin city, China's northern Heilongjiang province, 04 January 2016. The festival will run from 05 January to 05 February. (Photo by Wu Hong/EPA)

A worker polishes an ice sculpture ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2016. (Photo by Aly Song/Reuters)

A worker polishes an ice sculpture ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2016. (Photo by Aly Song/Reuters)

A worker polishes an ice sculpture ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2016. (Photo by Aly Song/Reuters)

Cleaners walk at an entrance of a park ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2016. (Photo by Aly Song/Reuters)

A worker polishes an ice sculpture ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2016. (Photo by Aly Song/Reuters)

A large snow sculpture is seen ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2016. (Photo by Aly Song/Reuters)

A worker polishes an ice sculpture ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2016. (Photo by Aly Song/Reuters)

Visitors look around ice sculptures ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2016. (Photo by Aly Song/Reuters)

A jet flies over ice sculptures ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2016. (Photo by Aly Song/Reuters)

People look around ice sculptures ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2016. (Photo by Aly Song/Reuters)

Workers polish an ice sculpture ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2016. (Photo by Aly Song/Reuters)

Workers polish an ice sculpture ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2016. (Photo by Aly Song/Reuters)

A horse stands in front of ice sculptures ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, Heilongjiang province, January 4, 2016. (Photo by Aly Song/Reuters)

A man takes a photo in front of ice sculptures at the China Ice and Snow World on eve of the opening ceremony of the Harbin International Ice and Snow Festival in Harbin, northeast China's Heilongjiang province on January 4, 2016. Over one million visitors are expected to attend the spectacular Harbin Ice Festival, where buildings of ice are bathed in ethereal lights and international ice sculptors compete for honours. (Photo by Wang Zhao/AFP Photo)